package cn.yi.medicalsys.filter;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 *  实现setvlet 接口 的过滤器
 * @author Administrator
 *
 */
public class EncodingFilter implements Filter {

	private String encoding="";
	
	@Override
	public void destroy() {

	}

	@Override
	public void doFilter(ServletRequest req, ServletResponse res,
		FilterChain chain) throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest) req;
		HttpServletResponse response = (HttpServletResponse) res;
		response.setContentType("text/html;charset=utf-8");
		request.setCharacterEncoding("utf-8");
		response.setCharacterEncoding("utf-8");
		
		
		chain.doFilter(req, res);//放行(不放行，页面无法显示)
	}

	@Override
	public void init(FilterConfig config) throws ServletException {
		encoding=config.getInitParameter(encoding);//实例化  初始化
	}

}
